diff --git a/perllib/FixMyStreet/Cobrand/Brent.pm b/perllib/FixMyStreet/Cobrand/Brent.pm
index 0c29041e92c..58c2b341c43 100644
--- a/perllib/FixMyStreet/Cobrand/Brent.pm
+++ b/perllib/FixMyStreet/Cobrand/Brent.pm
@@ -561,6 +561,7 @@ sub open311_update_missing_data {
 Reports made via the app probably won't have a NSGRef because we don't
 display the road layer. Instead we'll look up the closest asset from the
 WFS service at the point we're sending the report over Open311.
+We also might need to map one value to another.
 
 =cut
 
@@ -571,6 +572,12 @@ WFS service at the point we're sending the report over Open311.
             }
         }
 
+        my $ref = $row->get_extra_field_value('NSGRef') || '';
+        my $cfg = $self->feature('area_code_mapping') || {};
+        if ($cfg->{$ref}) {
+            $row->update_extra_field({ name => 'NSGRef', description => 'NSG Ref', value => $cfg->{$ref} });
+        }
+
 =item * Adds NSGRef from WFS service as app doesn't include road layer for Echo
 
 Same as Symology above, but different attribute name.
diff --git a/t/cobrand/brent.t b/t/cobrand/brent.t
index 87cd7e7654b..18f0cd60f3d 100644
--- a/t/cobrand/brent.t
+++ b/t/cobrand/brent.t
@@ -358,20 +358,24 @@ subtest "Open311 attribute changes" => sub {
             }
         );
         $problem->update_extra_field( { name => 'UnitID', value => '234' } );
+        $problem->update_extra_field( { name => 'NSGRef', value => 'BadUSRN' } );
         $problem->update;
 
         FixMyStreet::override_config {
             ALLOWED_COBRANDS => 'brent',
             MAPIT_URL        => 'http://mapit.uk/',
             STAGING_FLAGS    => { send_reports => 1 },
-            COBRAND_FEATURES =>
-                { anonymous_account => { brent => 'anonymous' }, },
+            COBRAND_FEATURES => {
+                anonymous_account => { brent => 'anonymous' },
+                area_code_mapping => { brent => { BadUSRN => 'GoodUSRN' } },
+            },
         }, sub {
             FixMyStreet::Script::Reports::send();
             my $req = Open311->test_req_used;
             my $c   = CGI::Simple->new( $req->content );
             is $c->param('attribute[UnitID]'), undef,
                 'UnitID removed from attributes';
+            is $c->param('attribute[NSGRef]'), 'GoodUSRN', 'USRN updated';
             like $c->param('description'), qr/ukey: 234/,
                 'UnitID on gully sent across in detail';
             my $title = $problem->title